Barcelona: Barcelona star Lionel Messi lost his appeal over tax fraud charges on Wednesday, meaning he could face a trial over the allegations which involve an estimated 4.6 million euros.The Argentine international and his father Jorge were accused last year of not paying tax on earnings from the player's image rights from 2007 to 2009.Both Messi and his father denied wrongdoing and instead pointed the finger instead at a former agent.But prosecutors in Barcelona on Wednesday decided to press ahead with the case."While it is understandable that a player of this magnitude is not aware of ...